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Soak them in Plus Gas or similar for as long as you can.
Weeks.
Forget them.
Soak for longer.
Then try heating the crank arms, aluminium expands faster than steel, but this might not help in the short term, as the cranks will in theory tighten onto the threads, not sure. A few cycles of heating then cooling may help to break the bond that’s formed between the steel and aluminium (this is an electrochemical bond I think I remember).
You might repeat step one if you’re not in a hurry.
If you’re not worried about keeping the pedal spindles clamp them firmly in a vice and turn the crank to get more leverage and unscrew the thread.
Check you’re turning the right way (left = left hand thread 🤪)
absurdbird
The odd set set were spare, I've only taken them out as I couldn't get the pedals axles off the good pair.
I have tried various tricks but to know avail, my next step was to apply more heat now that I have dismantled the pedals. I was hoping the alloy cranks would expand more than the chromoly axle's.
Any other suggestions?